package pact

import (
	"io/fs"
	"testing"
	"testing/fstest"

	"git.golem15.com/golem15/summercms/bonfire"
)

type configOnly struct{}

func (configOnly) ConfigFS() fs.FS {
	return fstest.MapFS{"config/config.yaml": {Data: []byte("k: 1\n")}}
}

type commandsOnly struct{}

func (commandsOnly) Commands() []bonfire.Command {
	return []bonfire.Command{{Name: "demo:run"}}
}

type bothCaps struct {
	configOnly
	commandsOnly
}

type neither struct{}

func TestOptionalCapabilitiesDiscoveredByTypeAssertion(t *testing.T) {
	plugins := []any{configOnly{}, commandsOnly{}, bothCaps{}, neither{}, extraMessage{}}

	var configs, commands, messages, none int
	for _, p := range plugins {
		_, hasCfg := p.(HasConfig)
		_, hasCmd := p.(HasCommands)
		_, hasMsg := p.(OptionalMessage)
		if hasCfg {
			configs++
		}
		if hasCmd {
			commands++
		}
		if hasMsg {
			messages++
		}
		if !hasCfg && !hasCmd && !hasMsg {
			none++
		}
	}
	if configs != 2 {
		t.Fatalf("HasConfig count = %d, want 2", configs)
	}
	if commands != 2 {
		t.Fatalf("HasCommands count = %d, want 2", commands)
	}
	if messages != 1 {
		t.Fatalf("OptionalMessage count = %d, want 1", messages)
	}
	if none != 1 {
		t.Fatalf("neither count = %d, want 1", none)
	}
}

func TestHasConfigReturnsFilesystem(t *testing.T) {
	var p HasConfig = configOnly{}
	fsys := p.ConfigFS()
	if fsys == nil {
		t.Fatal("ConfigFS returned nil")
	}
	raw, err := fs.ReadFile(fsys, "config/config.yaml")
	if err != nil {
		t.Fatal(err)
	}
	if string(raw) != "k: 1\n" {
		t.Fatalf("ConfigFS body = %q", raw)
	}
}

func TestHasCommandsReturnsNamespacedCommand(t *testing.T) {
	var p HasCommands = commandsOnly{}
	cmds := p.Commands()
	if len(cmds) != 1 || cmds[0].Name != "demo:run" {
		t.Fatalf("Commands = %+v", cmds)
	}
}

func TestOptionalMessageContract(t *testing.T) {
	var msg OptionalMessage = extraMessage{s: "hello-from-optional"}
	if msg.Message() != "hello-from-optional" {
		t.Fatalf("Message = %q", msg.Message())
	}
}

type extraMessage struct{ s string }

func (e extraMessage) Message() string { return e.s }